Briggs & Stratton 405777 Series - Numerical Number System

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BRIGGS & STRATTON NUMERICAL NUMBER SYSTEM
All Briggs & Stratton engines have a unique numerical designation system. Each engine is identified by a Model, Type and
Code number. Example: Model Type Code
405777 0125 01 99052115
This chart explains the numerical model designation system. It is possible to determine most of the important mechanical
features of the engine by merely knowing the model number. Here is how it works.
FIRST DIGIT
AFTER DISPLACEMENT
SECOND DIGIT
AFTER DISPLACEMENT
THIRD DIGIT
AFTER DISPLACEMENT
FOURTH DIGIT
AFTER DISPLACEMENT
CUBIC INCH
DISPLACEMENT
BASIC
DESIGN SERIES
CRANKSHAFT,
CARBURETOR,
 GOVERNOR
PTO BEARING,
REDUCTION GEAR,
AUXILIARY DRIVE,
LUBRICATION
TYPE OF STARTER
6
8
9
10
11
12
13
16
17
18
19
20
22
23
24
25
26
28
29
30
31
32
35
38
40
42
43
44
46
52
58
0
1
2
3
4
5
6
7
8
9
A to Z
0 − Horizontal Shaft
Diaphragm Carburetor
Pneumatic Governor
1 − Horizontal Shaft
Vacu-Jet Carburetor
Pneumatic Governor
2 − Horizontal Shaft
Pulsa-Jet Carburetor
Pneumatic or Mechanical
Governor
3 − Horizontal Shaft
Flo-Jet Carburetor
Pneumatic Governor
4 − Horizontal Shaft
Flo-Jet Carburetor
Mechanical Governor
5 − Vertical Shaft
Vacu-Jet Carburetor
Pneumatic or Mechanical
Governor
6 − Vertical Shaft
7 − Vertical Shaft
Flo-Jet Carburetor
Pneumatic or Mechanical
Governor
8 − Vertical Shaft
Flo-Jet Carburetor
Mechanical Governor
9 − Vertical Shaft
Pulsa-Jet Carburetor
Pneumatic or Mechanical
Governor
0 − Plain Bearing/DU
Non-Flange Mount
1 − Plain Bearing
Flange Mounting
2 − Sleeve Bearing
Flange Mounting
Splash Lube
3 − Ball Bearing
Flange Mounting
Splash Lube
4 − Ball Bearing
Flange Mounting
Pressure Lubrication on
Horizontal Shaft
5 − Plain Bearing
Gear Reduction
(6 to 1) CW Rotation
Flange Mounting
6 − Plain Bearing
Gear Reduction
(6 to 1) CCW Rotation
7 − Plain Bearing
Pressure Lubrication on
Vertical Shaft
8 − Plain Bearing
Auxiliary Drive (PTO)
Perpendicular to Crankshaft
9 − Plain Bearing
Auxiliary Drive
Parallel to Crankshaft
0 − Without Starter
1 − Rope Starter
2 − Rewind Starter
3 − Electric Starter Only
120 Volt Gear Drive
4 − Electric Starter/Generator
12 Volt Belt Drive
5 − Electric Starter Only
12 Volt Gear Drive
6 − Alternator Only
7 − Electric Starter
12 Volt Gear Drive
With Alternator
8 − Vertical Pull Starter or
Side Pull Starter
9 − Mechanical Starter
The type number identifies certain unique features such as the crankshaft or governed speed used on an engine.
The code number identifies the assembly date of the engine. In some instances it is necessary to know the code number as well
as the model and type number when performing adjustments, repairs or ordering replacement parts for an engine. Here is how
it works.
Example: 99052115
A. The first two digits, 99, indicate the calendar year, 1999.
B. The second two digits, 05, indicate the calendar month, May.
C. The third
two digits, 21, indicate the calendar month day.
D. The last two digits, 15, indicate the assembly line or manufacturing plant.
TSM